First off, I'll state I don't know much about Vocus other than that they have a habit of spamming journalists with PR releases that they NEVER read. Don't be that guy.
Do you really need enterprise level SM/press/PR tool? I work in a large enterprise, and I see things like this pitched all the time. Most never stand up to any real scrutiny for the pricing.
What are your specific goals? If you don't have these metrics clearly defined , you may have no idea how much value you get for that $5k / year. Even if this is allowing you to do a lot in 2 hours a day.
Do you have any in house talent that you can leverage ? One of the groups I work with had little or no marketing budget, we got smart and down and dirty. Now we are driving 3x as much traffic to our content as another group, that spends over $12k per month in media buys alone.
What alternatives have you looked at? I've very uncomfortable paying out $5k+ for an expensive magic bullet. And that is what Vocus sounds like to me. Some of my opinions on alternatives:
I have yet to meet any agency/tool that can do everything I need consistently well. A tool only gets you so far. Don't do what big brands are doing.They generally suck at it. Look at George Takei on FB. That is 1 guy on a laptop and he has the the #1 FB page. Social media is about talking person to person and sharing stuff like cat videos.
Speaking of cat videos, you have to be smart about this. I find 0% value in regurgitating someone else's content when over 95% of the stuff is mediocre and not worth sharing. Don't be that brand. Instead I suggest you use a service like LittleBird.com (starting @ $50/month) that will put you in front of a trend. Then you get to create truly unique & valuable content and interact with SMEs in the space. Letting you become a thought leader in the space. If you want to save money, the drop some feeds in Feedly and set up a content curation schedule and share the best stuff a few times a day. That takes me like 1 hour / day
No one reads them, except your competition. What's their purpose? Low level back-links and saying to your investors " Look we wrote a press release!". There are cheaper ways of doing this. You could get a fancy PR on PRWeb for $369 and then drive 5k views to the PRWeb listing for $5 and have it as the featured story on the PRWeb. You can also drive backlinks/traffic to the PR releases on other sites and get them ranked higher as well. But I would start with a $99 PR, get the process down and also look at other traffic generation tactics.
Got to HARO, helpareporter.com, sign up and start looking for reporters that are looking to write about your industry. Build those relationships.Then when you have something to pitch, you now have a contact. Do this daily.
All of this takes more work, but until you understand what actually works for your brand and market, I would keep my wallet in my pocket.. I'm not saying Vocus wouldn't work for you, I'm just saying you won't actually understand why or how it is or it's not working. Regardless what the sales people told you.